Warps the bitmap by pinching it toward the center or expanding the bitmap away from its center.

Parameter

Description

pBitmap

Pointer to the bitmap handle that references the bitmap on which to apply the effect.

nValue

Amount of stretching where :

Positive values: pinch the image toward its center.

Negative values: expand the image away from its center.

Valid values range from 500 to 500.

uStress

Amount of punching intensity. This value is ignored when nValue is less than 0. Valid values range from 0 to 1000.

CenterPt

POINT structure that contains the point around which the image will be pinched or punched.

crFill

The COLORREF value that specifies the fill color for any exposed areas. You can specify a COLORREF value, such as the return value of the Windows RGB macro, or you can use the PALETTEINDEX macro to specify a palette color.

uFlags

Flags that indicate how to handle exposed areas, both centrally and peripherally. You can use a bitwise OR (|) to specify one flag from each group.

The following are the flags that indicate how to handle peripherally exposed areas:

Value

Meaning

FILL_CLR

[0x0000] Fill any exposed areas with crFill.

FILL_RPT

[0x0001] Stretch the image edges to fill the exposed area.

FILL_NOCHG

[0x0002] Leave the exposed area as is, without changing it.

The following are the flags that indicate how to handle centrally exposed areas:

Value

Meaning

FILL_ROT

[0x0000] Rotate the image inside the pinch pattern.

FILL_WOUTROT

[0x0010] Fill the exposed center the same way the peripherally exposed areas are filled.

Returns

Comments

This function does not support signed data images. It returns the error code ERROR_SIGNED_DATA_NOT_SUPPORTED if a signed data image is passed to this function.

This function will punch or pinch the bitmap around the specified CenterPt. The center point must be defined inside the bitmap or inside the region, if the bitmap has a region.

If the bitmap has a region, the effect will be applied on the region only.

This function supports 12 and 16-bit grayscale and 48 and 64-bit color images. Support for 12 and 16-bit grayscale and 48 and 64-bit color images is available in the Document and Medical Imaging toolkits.

To update a status bar or detect a user interrupt during execution of this function, refer to L_SetStatusCallback.

This function does not support 32-bit grayscale images. It returns the error code ERROR_GRAY32_UNSUPPORTED if a 32-bit grayscale image is passed to this function.